Abstract
The objective of this work was to evaluate the influence of post-synthesis treatments applied on high ratio Si/Al commercial ZSM-5 zeolite on its properties and catalytic activity in oleic acid esterification with methyl acetate. Treatments as acidification, desilication, ion exchange and mechanical and ultrasound-assisted impregnation tungsten oxide were applied. The catalysts were properly characterized and the esterification reactions were performed at 240 °C, 1:10 oleic acid:methyl acetate molar ratio and 10% (m/m) catalyst concentration. Properties of the catalysts were significantly changed by the applied treatments, resulting in different yields and isomers distribution of cis and trans esters. The highest ester yield, equal to 66.71%, was obtained with zeolite subjected to ion exchange. This catalyst also provided an equal distribution between the two isomers. It was proposed, based on kinetic experiments, a mechanism for the reaction consisting of isomerization of oleic acid to elaidic acid followed by esterification of both fatty acids.
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